| 峡东奥陶纪末期笔石Tangyagraptus的厘定 |
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| 关键词:Tangyagraptus graptolite revision depth zonation |
| 基金项目:国地质调查局“中国古大陆环境变化及年代、生物、层序、事件、化学和构造地层响应”项目(编号2000113900072) |
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| A Revision of Late Ordovician Tangyagraptus (graptolite)in Eastern Yangtze Gorges Area |
| On the basis of a systematic collection and study of Late Ordovician Tangyagraptus (graptolite) in eastern Yangtze Gorges area, the genus Tangyagraptus is reclassified into 3 species, i.e., Tangyagraptus typicus , T. gracilis and T. remotus . The rhabdosomes of the first two species are relatively small in size, and the slender and uniform stripes of T. gracilis make it easy to distinguish these two species. The rhabdosomes of T. remotus are relatively large in size and the secondary stripes from the primary stripes are always beyond the 8 th thecae-far away from the sicula. These three species occupy different depths in the water column (depth zonation) in the ocean, thus alleviating the competition between each other. |
| WANG Chuan-shang,WANG Xiao-feng.2004.A Revision of Late Ordovician Tangyagraptus (graptolite)in Eastern Yangtze Gorges Area[J].Acta Geoscientica Sinica,25(1):47-51. |
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